The invention relates to the technical field of drainage pipe network accessory devices, in particular to a steel pipe cutting device used in the maintenance process of a drainage pipe network. The steel pipe cutting device is convenient to maintain and repair, and a cutting wheel is convenient to adjust so as to reduce the use limitation. The steel pipe cutting device comprises a worktable, a connecting plate, a rotating plate, two sets of supporting rods, two sets of left fixing blocks, a right fixing block, a lower fixing block, a hydraulic cylinder, a left fixing plate, a right fixing plate, a left rotating shaft, a right rotating shaft, a threaded rod, a rotary table, an adjusting plate, a front connecting rod, a rear connecting rod, a fixing rod and a driving shaft, wherein two groups of left supporting legs are respectively arranged at the left front side and the left rear side of the bottom side wall of the worktable; two groups of right supporting legs are respectively arranged on the right front side and right rear side of the bottom side wall of the worktable; the worktable is provided with a transition hole; the connecting plates are connected with the two sets of leftsupporting legs and the two sets of right supporting legs; and the bottom ends of the two sets of supporting rods are respectively connected with the front half area and the back half area of the lefthalf area of the top side wall of the connecting plate.